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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae2be147e827dfa1257b68d51bbb4d88ed4e2ddc0b48e9e17b596e1d12ccb3b8' 
  AND token = 'tYXr1D+z6mRH8vKCIr+vogfs/1+lFD1BFaXjshMDFIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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