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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66ae2e554435316a3339bfbda192fe4e32fd7db324174af4be0b010cae13b84e' 
  AND token = 'H4lSAcZRhEhkazpEFgcELzPIcQPhVWB3J79Ycmwc/rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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