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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ab1718e8bd1a3fab3ec42c23ec82e2aea04031eecb2eb81844a18664d97ba3' 
  AND token = 'QFFx5poQboJxSeA/9mD/4X3VsSQeGpnPCVnfPR0UDpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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