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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd3f5b7155236da623da02aa5061bf2f596cc9f7cb9390bd4c46226e4d4cfc3' 
  AND token = '51modu8g/rlVZfVPlu1krk7XP0iJ5tZdtGWmQTnGJ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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