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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6481501ef1f566bd4c19a41102b5dac1d5190fed7d1b8ff51d9fa9ebf41db9' 
  AND token = '5GI+t4EXGB+HBRTq6EGltx9AnEH5LKGIOQtNrPjNFL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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