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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1bf5ff080db572552d82ca11261d40cc6e27bdfc6fbb3780fbee03a8ae0b5cc' 
  AND token = 'ZC0mAfronct3rf/tihUZ+NvfXr+zbQ546HNSFmHb0Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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