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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0872af2e76f941ec0dd46773b4514c71683a8a1d2fdb273fda33fe57091300fc' 
  AND token = 'J+nFDWX94XGkl69mJGr0TWuxt1zHJJA0fyZMbBy6n44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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