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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c150e9356486ecdcea9bc0c5fe507590cf433dafd2b582932e08575c096d4b0' 
  AND token = 'IkJ/qLSYhClseH2tIj2A8pNbdAdEGhp6QnaMHvMJyAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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