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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cce684e58c42481c0c90fbd3c9cd567d5e3a3384bc272ef5e11210308a1a5f' 
  AND token = '+G8qdKLF5/fIQ5TZtrg62z2P3wQlAEauJD8O1F7e79w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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