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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d66d103a5155fbb3264fe49b6d34e8a127d3a994474800889a1b3f79be7d8b6' 
  AND token = 'WIBlmOtJgQ1uamKefgvtCOe4Vg8U5qz4SkTEbfVBOpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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