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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974eb1e5a0555313f8aa4c886f3ff4a7e547784d5c0b595acd27927fc679a0d3' 
  AND token = '/K8/Kiut8wMAe7c6clpN36eGdrFIdYRv9WzPqLl4Z2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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