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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1342ec5dc61a4e0b043ae7d263177d1e3272f1e02ce1b83ee0dfa07f8ac0c081' 
  AND token = 'jzmgtwZsfB+R07FfUUa+AlKAbErihpJB9nMG/V/iGLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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