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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d493e352212677a14f366ab083f10e64178f51ccdc36052702236c2e789549' 
  AND token = 'GRZN1xwbw6bZGlG1XgwMbC3Yp4QzftFJZr1e5tApp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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