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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5de85d7eba85c1c4972b72313f770d3fa3cd888d75428544927621df3fcdffa' 
  AND token = 'r6uBA4k5hPSAdaW1Efdud45EqVukExnspOJZrWaxsHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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