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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936009751a129d46c1d8638f0f36398f2a6ea369d6793f094ea8aaf061641c8f' 
  AND token = 'B0CLyN67uLU4zum+AfAzLEtVi3eJc91e+i18e07RVvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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