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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a6c2910c0496bf5a982dc570d2fa95201f51968d97d9a05a5f12fd8a2ec4ed' 
  AND token = '0mhT4kxpqDv1SojaRLz7HWjatqpNV5R2gyQvH5vW6BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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