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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03669e3d2b480d5698d4842e693e84a0e64fb37ef0654baa786a96accb023d1e' 
  AND token = 'SUifSzGHinDF091c5j+kLcPTnLV6sPOr2mHoiU6gLa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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