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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b951bdcea8a86c005eab42bdce2f52a15c9b020784c722718c5ad18443baefac' 
  AND token = '+BatUs8i9TFPK2xHyikI1dGH6GinX3c81yICIxhxOeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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