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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170d854a38b79a9bcf0acc8a288a8c70770a6d31d027155ea0d8cded165348a4' 
  AND token = 'v00B2kh4Le/ijwd4GGh/jsVTjpr+EHj/VQbS2ZgBM6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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