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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70392ddee863f543fbed162e754b2d58713dc54c901a6f51ed34e6cca7d71794' 
  AND token = 'r7qfTp9u87eHx3INVSEeT9cqR1zxt3SN/j0RBcnbzJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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