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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876f8f08d6b492e97f990ea4b0a5d31152d886386b5cc51b59a570b0ea6556c0' 
  AND token = 'ULaE/M7NxYj2yf9c9bvh2PYby25VUbx8xAEmXbcxMkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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