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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3d5d92467235c832622282f255b97eb69f53380fccd0fd255aea92610df195' 
  AND token = 'fBDSa0g+AXABVHbDjssoP6G/Qczy7l+6SH9+JpbfadU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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