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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0312f41f968ffc76c0775667e3237cb2343d031e5e32ac21362e432eb19e719b' 
  AND token = '0hMZFD8GNMN3M3z3XmGUlIs/Lyb2cSitbU7hcWU3EB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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