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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ee88e38686fe2f8afca45ac3b5870808fe20c987e02b4aa979c1e55ebd75f9' 
  AND token = 'vB9/KcNPQFh54mhHEydYSUC8CuqgZ3EW01AcVE4KeKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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