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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8340625d5a60e18b00d8ada04201711c37443db75d6acc2fb6d7f32cf719c11' 
  AND token = '5WQiloptaeL/fFoJBeQrQ3ja5iLAAJBIwtqRNH29zHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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