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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6100a521662423fb8c3d62f0fa41b4fb23b8d6b9a3cd4302a87899ac8e2a58' 
  AND token = '3a8PEMpaB+3Ze8CEaamxbpnFzj3t9kGPak7FlfG5D9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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