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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e87d414cbc3b84e18c7f24460d553798dca0508ce4a7fa82e5b89ef772d113' 
  AND token = '7IoPp1cfdFrxjLPr0GdWhsCMDLM3FCWVb58Av9rpE8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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