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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e58cecb19a1f24280af4d53e9a39744692aa1f22c1d8a38cdc461d8d01391b0' 
  AND token = 'xHUEZzSm7uz5X/NXVxxYOJaUGABYLS4iR64ESYNUJYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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