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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a909db97c62d67df3089ecfb55fe639a6533a0df668e9d6a559d6c4b90157a' 
  AND token = 'hjHCl0VytOfO1pkQFCahR1zrcdeNdxN0yvajnMxjFHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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