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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0af4233229001347142382d82b5267001f08634e7ca6aa4e2e427a2581a3d76' 
  AND token = 'J6/e0IfXPQUrp+yj+XjAjQZ3kh8Sj98N0QO0WTxxpac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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