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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06f7f612552e7fe8b5a9062d2a8f05a6610add063f196146e47e6c0e7ea70e2' 
  AND token = 'uy/vdMcdeHgj5c+InejUQbMFLjG+AUa6jYewkhffCng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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