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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7875fbf6d5f4ae1e6ece31a97fdeefda77dd3ff6222bb81d2c94ed46ca529633' 
  AND token = 't+z0ohgvDuooBbbmKjFw7I0fZf8u9YN4vVCNtg5trSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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