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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc31188829385ba29276987aec2ff15ad20b8f70b73c962f90d081a7804e133' 
  AND token = 'eeSgHnO7i7OsoDeG++nEmleo1Dw/E1osAqdnXBE0sE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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