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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da7a2303e3fccca989d33cd9fad8f4619578761d1d2b2829989a86a7514c8fd' 
  AND token = 'DsDuCgxfLuje1tIO73eVZ3eb1eRX669LLNbtoB+IdTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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