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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02906cb062f0e26bd4ea15ca5ce0db9f326bb97df54e5a6c527adaaeab5e20d9' 
  AND token = 'fLXYuLR3+PDRXJJTyFK+vIsgdrGeVHOqIJfmIKEOKHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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