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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcacf56ba021889211ff5d7fce72bd352cc01993f3f0dfa24849bc3223719cc' 
  AND token = 'mK7FCt5nKoRD1eaDsq03Oy73UGbgfvmXLCwzQeJMO3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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