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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fbd3d6f8c63ac3e368cd66fafdf355ad35f2dac5e89b11a8aca73fbc0d6c76' 
  AND token = 'CNQHL2xG45Ydo7Ds7vg8BqKKzJ1xN1Dow/CDwvITAPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}