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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff351adc9aa1239d1ff53b265da26c95e89774a7b7d03a8663cc5dadb444479' 
  AND token = 'EFvQHH+DCtasb5oC5Vj1WqkSPuChc/Nd+i95yP9YsJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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