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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0394c6d3ba7a22a7bdf9b1f834db37023ac8560efbb60ee8878d1710e6b4fe5e' 
  AND token = 'zDieGZcV9OmTSKBSV251kCJK61Lx4CvbokAKYXsajyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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