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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32398cbbbe3e4447f5d10861508301930494b5371ed3bfa9f1d590aaee3408de' 
  AND token = 'fEnkVqnvCx0ALkevpmUfOWsQx4z+FqCaEd4Dfa/mCnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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