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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d23b27dd172d8caf6e79ddc2d1dffa8d3554ebb04aa402a6a1d1684cc001f9' 
  AND token = 'Y5Zwpg4EVTeU5IzbhhorQn04VqMLZZ7WD6JWVl6wxgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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