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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93540209323fe340bdbafd1ff6f76912922f1a46b64d500fa292cbd4dba63183' 
  AND token = '5Lth8WMxPlL4IEAw1u60w10HUZYTA/ymz+UYxAaZpuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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