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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14e63a1f75ddf6a649958850b06c29deb591ac2cc9bc159057d3572bc288909a' 
  AND token = 'tfY3rl2WSUfWiiEI3I9D6w304/YX2z1uSvYaNIiUGEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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