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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d241923e0c667ebd3b7266387687e11e32f3351b973420c1a6a8aa5ced0cad' 
  AND token = 'ZnjM2TR2m7n+GVUOzsW/Yi76BDP9JaOt15Dd1JIgs+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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