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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da699c093beafd1c427c62c863ce37eab5eae67dc53dce56d5afc55b19bd75e' 
  AND token = 'Hf7aa2AgUAD0Pn1vby/nzIj3NDu3TT5BiERok+poDSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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