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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d32a9585aa8b2cdded856be90efca8e6b5b2e96e0b8d0e207ee7eeca9bb196f' 
  AND token = 'VzzNOSEyRpLJ0dAz9xkhRfBPhTNg/9AQ5OReN29I3h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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