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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020c7d1475baf213e18acd0f2a9f22582221a8233fb8cd7ed0c5731196f4cd69' 
  AND token = 'kjdWZ0hy4m6lErLovpyFhgbE+LGIRF4V/gg6WXE0e4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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