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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2fca34de672dd2fa54fb275c590fb79fa0d1c920df50a0aa6d2b58d757192d' 
  AND token = 'Nr/HjMDZK4Yb2bdpGr4z0CtWFHW3HftKX+Aa0eudfFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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