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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338d4d9250f118cf900255f9f3908b11fb317205ffc5e64eb9c8c643c7d90fcc' 
  AND token = 'LmCY/TD2I/j+Af2s74FVQMP94FE2seFG4Vy2c84PDas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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