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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944f44190bc291a029cd513f44de385599cb90967f8634e7772a9d5d2adc8b05' 
  AND token = 'pgPNI1EWri2qQwvkFmXKAElVS+pnn3BNw9m6oQal+iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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