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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b86c6346d667671f221258157bfd27e08ff8108ed2fe959f3029d4c11cfaf7c' 
  AND token = 'Dwjc5GIG29N2qkJ6W0WWj0CgJqke/NneT4SqMAha/TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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