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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a928cda2579bb4238b3aef37280434de29143d2ea2d5549e414f4aadca2ded' 
  AND token = 'z4+naJEiR0kcdPKhOQBUCLLqyLtleYDgwVn5TK0llRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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