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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6feba3a2fa0744a0fd77c6da0ba03e149e82251ae8128b33f1be55a5aa06366c' 
  AND token = '9jPElrxbWzLpfjKj2aaOFJalBs0eRPB9onarhXXvLO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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